Filter for aquarium



FIG. 1 is a perspective front view of a filter for aquarium showing mynew design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front elevation view thereof;

FIG. 5 is a rear elevation view thereof;

FIG. 6 is a left elevation view thereof; and,

FIG. 7 is a right elevation view thereof.

CLAIM The ornamental design for a filter for aquarium, as shown anddescribed.